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c. B. cox. SELF LOCKING CLUTCH FDR ELEVATORS, &c.

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Patented sept. i3, |898.

C. B. COX. SELF LOCKING CLUTCH FOR ELE-VATORS, &.c.

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nire rrane` CHARLES B. COX, OF NEV YORK, N. Y.

SELF-LOCKING CLUTCH FOR ELEVATORS, 80C.

SPECIFICATION forming part of Letters Patent No. 610,857, dated September 13, 1898. Application filed December 31,1896. Serial No. 617,678. (No model.)

To all whom t may concern:

Be it known that I, CHARLES B. Cox, a citizen of the United States, and a resident of New York, in the county and State of New York, have invented a certain new and usef or holdfast mechanism simple in construcl tion, automatic in action, inexpensive to manufacture, and efcient in practical use.

To attain the desired end, my invention consists in the construction, arrangement, and operation of parts herein set forth.

In the drawings which accompany and forma part of this specification, Figure l represents a side elevation, partly in section, of an elevator to which my invention is applied. Fig. 2 is a longitudinal section of my grip mechanism. Fig. 3 is a vertical section on the line 3 3, Fig. 2. Figs. 4, 5, and 6 are side views inpdetail of parts of my grip proper; and Figs. 7 and 8 are plan views in detail of other portions of the same, Figs. 5, 7, and 8 being partly in section.

Like letters of reference indicate like parts in all the views.

I have found it desirable to construct an automatic or self-working clutch or holdfast mechanism by means of which an elevator, duinb-waiter, dto., will be held, by means of its weight or counterweight 'acting upon the grip, in the position it may happen to be when the operator lets go the controlling-rope, and I have therefore constructed according to my invention an organization of the class described embodying the preferred construction of parts and their mutual relationship, combination, arrangement, vand organization in a composite body or structure, as hereinafter described.

Referring particularly to the drawings, A denotes my elevator-car or dumb-waiter, and A a hoisting-rope passing overa loose pulley C, working on the shaft B and attached to a counterweight D. The shaft B is ordinarily supported by roller-bearings inclosed in boxes F F', located at opposite ends of the shaft B and constructed as follows: fare a series of rollers of suitable length which work in a groove formed in said boxes.l These rollers have axles or pins, the ends of which are supported in flanges or rings f at such distances from each other that the rol-1ers will be maintained equidistant from each other and will inclose a space of the shaft B, to which. they are applied. These rollers are fitted into exterior boxes F F', as stated, within which they roll in the manner usual in this class of journals.

To the shaft B are rigidly secured a pulley E, in which the controlling-rope E works, and also a sleeve B, provided with a peripheral groove B2 andwith two pairs of oppositelylocated lugs B3, projecting from the ends thereof parallel to the longitudinal axis of the shaft B.

The pulley C is provided with a shoulder C', in which are formed two narrow (c2) and two wider and deeper (c3) peripheral concentric recesses, into the latter of which enter the projecting lugs B3 on one end of the sleeve B. The other pair of lugs B3 enter similar recessed portions G3 of an oscillating plate G, which also has rectangular smaller recesses G2V and is loose on the shaft A pair of iiat horizontal double-acting levers H, normally7 lyingin the direction of the shaft'B, above and below the same, engage both the `plateG and the recessed shoulder C of the pulley C by means of the narrow and vertically-enlarged rectangular ends H2 entering the recesses G2, and `the narrowed ends l-l, provided with a rounding bottom edge, entering the recesses C2. The levers H are also provided with central vertical portions H3, which are somewhat tapered and which said extremities extend into an interior groove F2 of the box F. Each vertical portion H3 of the levers H is inclosed Within a pair of curved shoes or friction-plates J, forming a brake, each lying at right angles to the levers H, said plates J forming a brake and being provided with beveled recesses J' to fit and partly cover the said tapered parts,within which a raised ,narrowed Working portion j is preferably formed to lessen the friction of the parts.

It is manifest that various omissions of some particulars could be made without materially affecting the essential features of my invention or the operation of the remaining IOO parts, and I do not therefore wish to be limited to the specic structural details of the organization herein set forth. Obviously the elements of the structure described may be located 'at an angle to the plane in which they are shown.

Upon the rope E being raised or lowered the lugs B3 of the sleeve B', rigidly attached to the shaft B, will bear against either one side or the other of the recesses C3 and G2, and the recesses of the shoulder C of the pulley C and plate G are so relatively disposed that when either of such movements occurs the ends H and H2 of the levers H and the engaged portions of the recesses G2 C2, into which they enter, will all proXimately register in one plane through the longitudinal aXis of the shaft B. Consequently upon the pulley C being rotated by the sleeve B' the vertical portion H3 of lever H and the shoes or friction-plates J will revolve around the shaft B within the groove F2. Upon, however, letting go of the rope E the pulley C, which is loose upon the shaft B, will be actuated either by the elevator-car A or the counterweight D, and the recesses C2 will move the end H of the lever H, thus throwing the same out of the plane of the longitudinal axis of the shaft B, and the rectangular edges or sides of the vertical portion H2 will force the shoes or friction-plates J farther apart, thus engaging the sides of the groove F2 and cramping the parts, so that fu rther movement of the pulley C is checked. Obviously this result maybe accomplished by the action of the edges of the vertical portion H3 alone; but I prefer, in order to secure greater durability of the parts, to use in connection therewith the shoes J. When the elevator, &c., is started again, the hoistingsleeve B engages the oscillating plate G, that now, as it were, wants to go or is going in the same direction. In case there is a load on the elevator, &c., the lug B3 of the sleeve B may notengage the side of the recess in the shoulder C', but will engage the oscillating plate G, and thus straighten or bring in line with the shaft B the levers H, thereby unlocking the gripping mechanism.

Great durability and efficiency of action is secured by the fact that I use no springs, and my gripping mechanism per se is inactive, although it is automatically actuated by the main shaft of the operating-pulley and also by the counterweight-pulley. I use the term inactive in contradistinction to the springactuated gripping mechanism frequently used. A

As it is evident that many changes in the construction and relative arrangement of parts lmight be resorted to without departing from the spirit and scope of my invention, I would have it understood that I do not restrict myself to the particular construction and arrangement of parts shown and described, but that I reserve the right to make such changes, and that What I claim as my invention is ,1. The combination, with a shaft, of an operating-pulley, fixed on said shaft, a hoistingpulley, loose on said shaft and provided with two narrowT and two wider and deeper concentric recesses, a part connected with so as to be held against rotation on said shaft, and provided with lugs, to engage one set of said recesses, levers, provided with vertical portions, operatively engaging said part, and provided with narrowed rounding ends to work in the other set of recesses of said hoisting-pulley, and a brake consisting of plates, provided with beveled recesses,and controlled by said levers.

2. The combination, with a shaft B, of an operating-pulley l, fixed on said shaft, a hoisting-pulley C, loose on said shaft and provided with a shoulder having two narrow and two wider and deeper concentric recesses C2, C3, a plate G, on said shaft, and parallel with said hoisting-pulley and provided with recesses G3, and smaller recesses G2, a part B', connected with so as to be held against rotation on said shaft, and provided with lugs B2, adapted to engage said recesses C3, G3, levers H engaging notches C2, and G2, in said shoulder and plate and having vertical portions H3, a stationary box F, provided with a groove F2, and a brake J, adapted to engage the groove of said box and adapted to be engaged by the vertical portions H2, of said levers.

In testimony of the foregoing specification I do hereby sign the same, in the city of Brooklyn, county of Kings, and State of New York, this 10th day of December, A. D. 1896.

CHARLES B. COX.

Vitnesses:

J. ODELL FowLnr., J r., G. H. OLDRING.

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